So, we've all heard of "track hack" or "pursuiter's cough" or whatever you want to call it when you cough right after a burst of exertion. I think what I am asking about is different, as it happens under certain temperature conditions.
I remember when i was a kid, and went to play outside in the afternoon/evening and stayed out to dusk. After I'd stopped running around and had calmed down a bit, it would often happen that I'd cough (unproductively) if I took a deep breath. I'd forgotten about this until the other day, after a long ride at that time of day. I had assumed it was some combination of exercise and the drop in air temperature (and change in humidity) at dusk, but now I've been thinking. Anyone else noticed this? Sound like asthma? Allergies? I rode all this past icy and cold-as-hell Chicago winter with no problem at all.
I had forgotten about this for so long because it only happens after relatiely long bouts of exercise, with the air cooling, and only lasts for a few minutes afterward. So the cough isn't at all troublesome, and never presents during exercise.